Monday, 15 October 2012

Pocono moutains

The Poconos  is a mountain area in northeastern Pennsylvania, United States. It is about 6,200 sq km of wooded mountains and valleys full of beautiful trees, lakes, rivers and wildlife. In fall, the trees are changing colours in the pocono mountains, the trees that turn mostly bright yellow and orange are birch, ash, sugar maple, aspen, walnut, and few others. The trees that turn red are oak, red maple, sumac, dogwood, black gum and others.

Why do leaves change colour in the fall? Trees make their food  through the process of photosynthesis using sunlight to make sugars from carbon dioxide and water in the presence of chlorophyll. Chlorophyll gives leaves their green colour and masks out the colours of any other pigments that may be present in the leaf. Winter days are short and dry. Many plants stop making food in the fall. The chlorophyll break down themselves. Then we can see orange and yellow colours. These colours were in the leaves all summer, but they green chlorophyll covered them up. 

Some leaves like maples turn red. This is because the food is trapped in the leaves after photosynthesis stops. Brown colours are come from wastes left in the leaves.

The joy of looking and comprehending is nature's most beautiful gift.
-- Albert Einstein

1) Autumn leaves and fall foliage: here

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